How can I automatically request administrator privileges for my Go application in Windows?

Requesting Administrator Privileges in Windows with Go

This article explores how to eliminate the need for manually selecting "Run as administrator" when launching an application, enabling it to prompt for admin permissions automatically.

Issue Description:

The question stems from the inability to write to a Windows system folder (C:Windows) without elevated privileges. When running the provided code, the application fails to write to the test.txt file with an "Access is denied" error.

Solution:

To address this issue, a method involving self-relaunching the application with elevated privileges is presented. This technique utilizes the following approach:

1. Checking for Admin Status:

The amAdmin() function checks if the application is running as an administrator by attempting to open the .PHYSICALDRIVE0 device. If access is granted, the function returns true; otherwise, it returns false.

2. Relaunching with Elevation:

If amAdmin() returns false, the runMeElevated() function is executed. This function uses the Windows ShellExecute API to relaunch the application with elevated privileges. It specifies the "runas" verb, which prompts the user for administrator permission.

3. Main Function Execution:

The main function first checks if the application has administrator privileges. If not, it invokes the runMeElevated() function to relaunch itself as administrator. If the application is already running with elevated privileges, it proceeds to execute the intended code.

Code Sample:

package main

import (
    "fmt"
    "golang.org/x/sys/windows"
    "os"
    "syscall"
    "time"
)

func main() {
    // If not elevated, relaunch by shellexecute with runas verb set
    if !amAdmin() {
        runMeElevated()
    }
    time.Sleep(10 * time.Second)

}

func runMeElevated() {
    verb := "runas"
    exe, _ := os.Executable()
    cwd, _ := os.Getwd()
    args := strings.Join(os.Args[1:], " ")

    verbPtr, _ := syscall.UTF16PtrFromString(verb)
    exePtr, _ := syscall.UTF16PtrFromString(exe)
    cwdPtr, _ := syscall.UTF16PtrFromString(cwd)
    argPtr, _ := syscall.UTF16PtrFromString(args)

    var showCmd int32 = 1 //SW_NORMAL

    err := windows.ShellExecute(0, verbPtr, exePtr, argPtr, cwdPtr, showCmd)
    if err != nil {
        fmt.Println(err)
    }
}

func amAdmin() bool {
    _, err := os.Open("\\.\PHYSICALDRIVE0")
    if err != nil {
        fmt.Println("admin no")
        return false
    }
    fmt.Println("admin yes")
    return true
}

By implementing this method, the application will automatically prompt for administrator permission when launched normally, eliminating the need for manual elevation via the right-click menu.

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